LeetCode //C - 1281. Subtract the Product and Sum of Digits of an Integer

1281. Subtract the Product and Sum of Digits of an Integer

Given an integer number n, return the difference between the product of its digits and the sum of its digits.

Example 1:

Input: n = 234

Output: 15

Explanation:

Product of digits = 2 * 3 * 4 = 24

Sum of digits = 2 + 3 + 4 = 9

Result = 24 - 9 = 15

Example 2:

Input: n = 4421

Output: 21

Explanation:

Product of digits = 4 * 4 * 2 * 1 = 32

Sum of digits = 4 + 4 + 2 + 1 = 11

Result = 32 - 11 = 21

Constraints:

• 1 <= n <= 10^5

From: LeetCode

Link: 1281. Subtract the Product and Sum of Digits of an Integer

---

Solution:

Ideas:

Extract each digit using % 10, update the product and sum, then return res - sum.

Code:

int subtractProductAndSum(int n) {
    int num = n;
    int sum = 0;
    int res = 1;
    while(num != 0){
        sum += num % 10;
        res *= num % 10;
        num /= 10;
    }
    return res - sum;
}